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The open production runtime for long-running agents

Build, operate, and improve autonomous agents on infrastructure you own.

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01

Give this to your Claude Code, Cursor, or Codex.

Run pip install cayu and create a code review agent.

One sentence. The agent figures out the rest.

02

Where Cayu fits

Build the agent. Own the stack.

You build

The agent product.

  • Product experience
  • Domain logic
  • Business rules

Cayu provides

The harness and runtime.

  • Harness: context, model, tools, policies
  • Runtime: sessions, budgets, recovery
  • Evidence: events, trajectories, evals

You deploy

The stack you choose.

  • Models and sandboxes
  • Vaults, storage, and proxies
  • The runtime itself

The harness controls how the agent reasons and acts. The runtime makes that work durable, governed, recoverable, and deployable.

03

When the agent is the application

A working agent is step one.

Production means durable state, controlled authority, bounded spend, human intervention, recovery, and evidence.

Why agents need a runtime

Recovery

Work survives the process.

Crash mid-run. Resume from the evidence.

Cost control

Control every dollar.

Set the budget first. Reconcile every dollar.

66% lessCache-aware compaction
49% lessCompacted research branches
See the live benchmark

Security by design

Your agent never sees the secret.

With virtual credentials, real keys stay outside the sandbox.

PlaceholderTrusted brokerProvider
See virtual credentials

Composable by contract

Bring your stack.

Models, runners, vaults, stores, proxies, and memory sit behind explicit Python contracts.

SandboxVaultMemoryProxyModelsMCP
Explore the runtime contracts
04

Deployment ownership

Bring the runtime to the work.

Run Cayu wherever your data, credentials, models, and business systems already live.

Platform as a service

Ship on Fly or Render.

Deploy Cayu as a Python service on the platform your team already uses.

Your cloud

Keep the operation in your AWS account.

Use AWS-native compute, storage, networking, credentials, and observability.

Private enterprise

Stay inside the boundary.

Run inside your VPC, on-premises environment, or air-gapped network with models and dependencies inside the same boundary.

Your product. Your runtime. Your infrastructure.

05

Capabilities unlocked by ownership

Full control changes what you can build.

Configure the runtime. Replace its components. Modify the source. Compose capabilities beyond a fixed product menu.

Build agents that improve themselves under rules you own.

  1. 01Run
  2. 02Observe
  3. 03Experiment
  4. 04Verify
  5. 05Promote
  6. 06Run again
Human-guidedHuman-supervisedFully autonomous
Explore the runtime design space
  • Code reviewer
  • Research analyst
  • Negotiation agent
  • Support operator
  • Operations agent
  • Finance analyst
  • Compliance reviewer
  • QA engineer
  • Incident responder
  • Recruiting coordinator
  • Procurement agent
  • Reporting agent
  • Code reviewer
  • Research analyst
  • Negotiation agent
  • Support operator
  • Operations agent
  • Finance analyst
  • Compliance reviewer
  • QA engineer
  • Incident responder
  • Recruiting coordinator
  • Procurement agent
  • Reporting agent

Build agents you can trust with real work.

Own the loop.Own the margin.Explain every outcome.

Build with Cayu